Type-writing machine.



Patented Aug. 5, 1913.

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E8 PATNT FTQ.

ALFRED Gr. F. KUBOWSKI, OF BROOKLYN, NEVT YORK, ASSIGNOR TO UNDERWOOD TYPEWBITER COMPANY, OF NEW YORK, N. 55., A CORPORATION OF DELAWARE.

TYPE-WRITING MACHINE.

T 0 all whom it may concern:

Be it known that I, Am nnn G. F. KURow- SKI, a citizen of the United States, residing in Brooklyn borough, in the county of Kings, city and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

My invention relates to means for facilitating the removal of the platen frame from the typewriter carriage.

An object of my invention is to construct the platen frame and guides, so that the former may be quickly disconnected and removed.

A further object is to obviate the necessity of re-adjusting the parts when the platen frame is replaced. The disconnection is accomplished by the simple operation of a single lever.

Other features and advantages will hereinafter appear.

In theaccompanying drawings, Figure 1 is a top plan view of my invention attached to an Underwood typewriter carriage which is partly broken away. Figs. 2 and 3 are left and right end views respectively. Fig. 4L shows the platen frame partly removed from its carriage. Fig. 5 is a perspective of the right end of the platen frame and carriage to illustrate my invention more clearly.

The usual platen 1 is fast on an axle 2 mounted in bearings 3 in the ends elof a platen frame 5 (Fig. he platen frame ends a are connected by a tie bar 6, and are supported by trunnions 7 in open bearings 8 of guide arms 9, 10 on a rock shaft 11, so that the platen frame 5 may be raised to print a capital letter. The usual shift rail 12, upon which rides a roll 13, raises the platen frame. The roll is prevented from accidental displacement by the usual hook 1% on the platen frame.

Adjustable stops 15 on the carriage 16 engage projections 17 from the platen frame 5, limiting its upward or capital shift movement. To prevent the platen frame from swinging around the stops 15, there is employed a guide arm 18 which is pivoted at 19 to the carriage 16. This arm has an open slot 20 in its free forward end to receive a stud 21 on the platen frame, so that the combined actions of arms 18 and 9 will give a parallel up and down motion to the platen frame.

Specification of Letters Patent.

Application filed. May 25, 1912.

Patented Aug. 5,1913.

Serial No. 699,639.

To remove the platen frame, the guide arms 9, 10 and 18 are disconnected by means of an arm 22 pivoted to the carriage frame 16 at 23. This arm 22, having a fingerpiece 24, is formed with a cam edge 25, to engage a pin or projection 26 on the rockarm 9, whereby the said arms 9, 10 may be drawn down clear of the trunnions 7. In order that the guide arm 18 may also be disconnected, a link 27 connects it to arm 9. The platen frame may then be lifted or tilted up and back allowing the platen frame projections 17, escape stops 15, and the hook 1% to swing out from under the shift rail 12, so the platen frame is freed to be remover entirely from the carriage 10. While the platen frame is out of the carriage, the guide arms 9, 10 and 18 are held against the tension of the platen counterbalancing spring 28 on shaft 11, by a seat or notch 25, into which the projection 26 of arm 9 snaps; said notch formed at the end of the cam edge To replace the platen frame 5, it is only necessary to lower it into the carriage, and locate the hook 14: under the shift rail 12, and then release the cam arm 22 so that the counterbalancing spring 28 will raise the arms 9, 10 to engage the trunnions 7. The link 27 draws the arm 18 to position to engage the stud 21. The cam arm 22 is held normallv in an inoperative position against a stop 29 by means of a spring 30.

Variations may be resorted to within the scope of the invention, and portions of the in'iprovements may be used without others.

Having thus described my invention, I claim:

1. In combination with a typewriter carriage, a platen frame having bearings in guide arms which control said platen frame while being raised and lowered in said carriage, stops to limit the height of raising said platen frame in said carriage, and a guide arm having an open slot to engage a stud on said platen frame to prevent it swinging around said limit stops.

2. In combination with a typewriter carriage, a platen frame having hearings in guide arms which control said platen frame while being raised and lowered in said carriage, stops to limit the height of raising said platen frame in said carriage, a guide arm having an open slot to engage a stud on said platen frame to prevent it swinging around said limit stops, and a link to support said guide arm in position, while engaging the stud of said platen frame.

3. In combination with a typewriter car riage, a platen frame having hearings in guide arms which control said platen frame while being raised and lowered in said carriage, stops to limit the height of raising said platen frame in said carriage, a guide arm having an open slot to engage a stud on said platen frame to prevent it swinging around said limit stops, and a link connecting the platen frame guide arm with the bearing guide arms.

4. Theherein described improved platen shifting mechanism comprising a rock shaft, arms thereon for supporting the platen frame, said arms having open bearings, a platen frame having gudgeons en gaging said open bearings, a guiding arm pivoted to the carriage and having an open bearing, a stud on the platen frame engaging said guiding arm, and a link connecting said guiding arm with one of said rock arms, all constructed and operating substantially as set forth.

5. In a typewriting machine, the combination of a platen frame, arms on which it is mounted to shift to different case positions, and a cooperating pivoted guiding arm for said platen frame; all of said arms having open bearings and said platen frame having gudgeons engaging said bearings and movable therefrom to detach the platen frame from the machine, the first-mentioned arms being depressible to disengage them from their gudgeons, and a link connecting said guiding arm to one of the first-mentioned arms to effect simultaneous disengagement of said guiding arm.

7. In a typewriting machine, the combination of a platen frame, arms on which it is mounted to shift to different case positions, a cooperating pivoted guiding arm for said platen frame, all of said arms having open bearings and said platen frame having gudgeons engaging said bearings and movable therefrom to detach the platen frame from the machine, the firstmentioned arms being depressible to disengage them from their gudgeons, a link connecting said guiding arm to one of the first-mentioned arms to effect simultaneous disengagement of said guiding arm, and a cam provided with a finger-piece to disengage all of said arms from their gudgeons.

8. In a typewriting machine, the combination of a carriage, arms having open bearings and mounted on said carriage, a platen frame having gudgeons whereby it is mounted in said bearings, a guide arm pivoted upon said carriage and having an open bearing, said platen frame having a gudgeon to engage said open bearing, and means connecting said guide arm to one of the first-mentioned arms.

9. The combination with a carriage, of a platen frame, upper and lower arms pivoted on the carriage to' guide the platen frame,

.and means for simultaneously effecting disengagement between the platen frame and said upper and lower guiding arms.

ALFRED G. F. KUROVVSKI. Vitnesses J ULIUS DUGKSTINE, F. E. ALEXANDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, I). C. 

